Re–Os and Ar–Ar dating of the Dahu Au (Mo) deposit in the Xiaoqinling area, West Henan: Constraint on its metallogenetic stages

XIE Gen; YU Guangming; SHI Guanghai; YANG Guoqiang; WANG Yuwang; WANG Jian; SHI Lianwu

doi:10.12029/gc20210425002

2024 Vol. 51, No. 4

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XIE Gen, YU Guangming, SHI Guanghai, YANG Guoqiang, WANG Yuwang, WANG Jian, SHI Lianwu. 2024. Re–Os and Ar–Ar dating of the Dahu Au (Mo) deposit in the Xiaoqinling area, West Henan: Constraint on its metallogenetic stages[J]. Geology in China, 51(4): 1411-1421. doi: 10.12029/gc20210425002

Citation:

XIE Gen, YU Guangming, SHI Guanghai, YANG Guoqiang, WANG Yuwang, WANG Jian, SHI Lianwu. 2024. Re–Os and Ar–Ar dating of the Dahu Au (Mo) deposit in the Xiaoqinling area, West Henan: Constraint on its metallogenetic stages[J]. Geology in China, 51(4): 1411-1421. doi: 10.12029/gc20210425002

Re–Os and Ar–Ar dating of the Dahu Au (Mo) deposit in the Xiaoqinling area, West Henan: Constraint on its metallogenetic stages

1.
Center for Geophysical Survey, China Geological Survey, Langfang 065000, Hebei, China
2.
Command Center for Integrated Natural Resource Survey, China Geological Survey, Beijing 100055, China
3.
School of Gemmology, China University of Geosciences (Beijing), Beijing 100083, China
4.
Institute of Geology and Mineral Resources Exploration of Henan Province, Zhengzhou 450000, Henan, China
5.
Beijing Institute of Geology for Mineral Resources Co. Ltd., Beijing 100012, China
6.
School of Earth and Ocean Sciences, Cardiff University, Cardiff CF10 3AT, UK

Fund Project: Supported by the projects of China Geological Survey (No.DD20243183, No.DD20230471), Science and Technology Innovation Foundation of Geophysical Survey Center (No.DKC20230003) and National Crisis Mine Project (No.200699105−5).

More Information

Author Bio: XIE Gen, male, born in 1987, senior engineer, mainly engaged in research on petrology and mineral deposits; E-mail: xiegen@mail.cgs.gov.cn

Received Date: 25 April 2021

Revised Date: 30 September 2021

Publish Date: 25 July 2024

Abstract

Abstract

This paper is the result of mineral exploration engineering.
Objective
The East Qinling molybdenum belt which located in the North China craton is the second largest Mo belt in the world, among which occur the most famous orogenic gold deposits of the Xiaoqinling. In recent years, through the implementation of geological survey engineering, molybdenum mineralization with industrial significance has been found in the deep of Dahu Au (Mo) deposit from Xiaoqinling area, and molybdenum ore mining has begun. Through the constraint on its metallogenetic stages, it is helpful to study the Au−Mo metallogenic regularity.
Methods
In this paper, based on the Crisis Mine deep−seated deposits prospecting in Xiaoqinling area, we studied the metallogenic model of deep Au (Mo) deposit, and analyzed the role of molybdenite Re–Os and K–feldspar ⁴⁰Ar/³⁹Ar isotope dating in the classification of metallogenic stages.
Results
Six molybdenite samples from the S35 ore vein yield Re–Os isotopic isochron age of (214.9±5.2) Ma (MSWD=0.77), with model ages ranging from (192.3±2.9) Ma to (223.4±3.2) Ma. K–feldspar samples from F5 ore vein yield Ar–Ar weighted plateau age of (95.22±1.16) Ma and the isochron age of (95.10±4.57) Ma.
Conclusions
Molybdenite age suggests that the Mo mineralization in S35 vein occurred in Indosinian period, and K–feldspar age indicates a new tectono–magmatic–thermal event during the Middle Yanshanian, and this hydrothermal event may contribute to metallogenic activity of Au (Mo) deposit, which superimposed the molybdenum mineralization events of Indosinian. Combined with the results of hand samples and BSE images analysis, it is concluded that there are at least two episodes of hydrothermal event related to Au (Mo) mineralization in Dahu Au (Mo) ore district.
- Mo mineralization /
- Re–Os isotopic age /
- ⁴⁰Ar/³⁹Ar isotopic age /
- Indosinian /
- Yanshanian /
- mineral exploration engineering /
- Dahu Au (Mo) deposit /
- Xiaoqinling /
- West Henan Province

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References

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